A low-temperature extraction and concentration processing device and process for astaxanthin from marine shrimp and crab

Abstract

This invention discloses a low-temperature extraction and concentration processing device and process for astaxanthin from marine shrimp and crab, specifically relating to the field of aquatic food product processing technology. It includes a low-temperature processing cylinder and a carrier box. A pretreatment component is provided between the low-temperature processing cylinder and the carrier box, and this pretreatment component is used to decompose shrimp and crab shells into a large number of fine fragments to significantly increase the contact surface area of ​​the materials during extraction. The pretreatment component includes a decomposition cylinder fixedly connected to the junction of the low-temperature processing cylinder and the carrier box, and a decomposition toothed seat disposed inside the carrier box. Through the arrangement of the decomposition toothed seat, decomposition cylinder, force column, and swing rod, the force column and swing rod can guide the shrimp and crab shells driven by rotation into the channel between the decomposition toothed seat and the decomposition cylinder. The wide end of the channel formed by the decomposition cylinder and the decomposition toothed seat can accept irregularly shaped shell fragments with low flow resistance, and the tapered cross-section can force the shell fragments to slide along the constraint wall and adaptively adjust their posture.

Description

Technical Field

[0001] This invention relates to the field of aquatic food product processing technology, specifically to a device and process for low-temperature extraction and concentration of astaxanthin from marine shrimp and crab. Background Technology

[0002] Shrimp and crab shells are typical by-products of aquatic product processing. They are not homogeneous structures, but natural biocomposite materials composed of chitin fibers (reinforcing phase) embedded in a calcium carbonate-protein matrix (matrix phase). They are also important raw materials for the deep processing and fermentation of aquatic products. This multi-level composite structure gives shrimp and crab shells excellent mechanical strength and forms a natural physical barrier that encapsulates and protects the astaxanthin inside. The core of the pretreatment for low-temperature extraction of astaxanthin lies in tearing chitin fibers and destroying the cell phospholipid membrane structure by means of mechanical action such as grinding, high-pressure shearing or cavitation effect, so that the intracellular astaxanthin esters are converted into a solvent-accessible free state, and the two natural barriers of chitin skeleton and cell membrane are broken at the same time. It can be seen that shrimp and crab shell crushing and breaking equipment does not only achieve simple crushing of materials, but its core function is to provide the basic conditions for efficient mass transfer in low-temperature extraction conditions. Astaxanthin is an intracellular bound product, and the shells of shrimp and crabs are hard and dense, resembling bioceramics. Without deep cell disruption, the low-temperature extraction process is difficult to carry out effectively, resulting in low extraction efficiency and failing to meet subsequent production needs. However, in the pretreatment of raw materials for low-temperature astaxanthin extraction, existing equipment typically requires repeated cyclic crushing or extended residence time in the crushing chamber to obtain a higher specific surface area. In order to expose more lipid layers and improve the fineness of crushing, frictional heat accumulation is inevitably aggravated, causing some astaxanthin to undergo thermal degradation or oxidative inactivation during the pretreatment stage, thus affecting the overall efficiency and quality of low-temperature astaxanthin extraction. Summary of the Invention

[0003] The purpose of this invention is to provide a device and process for low-temperature extraction and concentration of astaxanthin from marine shrimp and crab, in order to solve the above-mentioned shortcomings in the technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a low-temperature extraction and concentration processing device and process for marine shrimp and crab astaxanthin, comprising a low-temperature treatment cylinder and a carrier box, wherein a pretreatment component is provided between the low-temperature treatment cylinder and the carrier box, and the pretreatment component is used to decompose the shrimp and crab shells into a large number of fine fragments, so as to significantly increase the contact surface area of ​​the material during the extraction process. The pretreatment assembly includes a decomposition cylinder fixedly connected to the junction of the low-temperature treatment cylinder and the carrier box, and a decomposition tooth seat disposed inside the carrier box. The decomposition tooth seat is located inside the decomposition cylinder. The two cooperate with each other to form a figure-eight shaped channel for guiding the directional flow of shrimp and crab shells. A receiving plate is movably connected inside the carrier box, and the receiving plate is sleeved on the bottom of the decomposition tooth seat. Several force columns and swing rods are installed at the junction of the low-temperature treatment cylinder and the decomposition cylinder. A first servo motor is installed at the bottom of the carrier box, and the output end of the first servo motor extends into the interior of the carrier box and connects with the receiving plate. The cryogenic treatment cylinder is equipped with a rapid separation component inside, which drives several force columns and swing rods to move up and down and swing in an arc along the connection between the cryogenic treatment cylinder and the decomposition cylinder. The interior of the carrier box is equipped with a multi-directional component, which is used to push the thin shell on the surface of the receiving plate towards the outlet of the carrier box while making contact with the surface of the decomposition tooth seat.

[0005] Preferably, the fast separation component includes a hollow frame fixedly connected to the junction of the cryogenic treatment cylinder and the decomposition cylinder, and a hinge block fixedly connected to the bottom of the force core column. The bottom of the hinge block extends into the interior of the swing rod and forms a hinge with the swing rod inside. The swing rod is movably sleeved on the outside of the hollow frame, and the hollow frame is used to restrict the movement direction of the swing rod. The top of the hollow frame is movably connected to a bottom ring frame, and the top of the bottom ring frame is designed as a trapezoidal structure. The top of the force core column is fixedly connected to a support block, and the bottom of the support block is movably connected to a loosening roller, and the surface of the loosening roller slides with the top of the pre-divided ring frame.

[0006] Preferably, a toothed ring is fixedly connected to the bottom of the pre-divided ring frame, and the toothed ring is located inside the bottom ring frame. A mounting box communicating with the inside of the bottom ring frame is fixedly connected to the outside of the bottom ring frame. A second servo motor is fixedly connected inside the mounting box. A gear is fixedly connected to the output end of the second servo motor, and the outside of the gear is located inside the bottom ring frame and meshes with the toothed ring. The top of the bottom ring frame is provided with a reciprocating hole for guiding the movement of the force core column, and the size of the reciprocating hole is adapted to the force core column; An adjustment component is provided between the decomposition tooth holder and the bottom ring frame. The adjustment component is used to fine-tune the distance between the decomposition tooth holder and the bottom ring frame, and at the same time, the angle between the decomposition tooth holder and the decomposition cylinder is adjusted synchronously.

[0007] Preferably, the inter-adjustment assembly includes an adjusting bolt screwed onto the top of the decomposition tooth seat and a centering ring installed between the receiving plate and the bearing box. The top centering ring allows the decomposition tooth seat to move along the interior of the receiving plate. A connecting guide seat is installed on the top of the decomposition tooth seat, and the connecting guide seat, the decomposition tooth seat, and the centering ring are all provided with a screw hole for the adjusting bolt to engage with the screw. The top of the adjusting bolt has a groove that communicates with the inside of the screw hole, and the groove fits into the bottom of the connecting guide seat. Several elastic components are provided between the decomposition tooth seat and the centering ring.

[0008] Preferably, each of the elastic components includes a ball cylinder fixedly connected to the bottom end of the disintegration gear seat and a return spring fixedly connected inside the centering ring, wherein a ball is fixedly connected to the top of the return spring, and the top of the ball extends into the interior of the ball cylinder.

[0009] Preferably, the multi-directional assembly includes a multi-directional frame fixedly connected inside the carrier box and a stop plate movably connected to the side of the multi-directional frame near the decomposition tooth seat, and the stop plate and the decomposition tooth seat maintain a slope fit. A transverse column tooth plate is fixedly connected to one side of the multi-directional frame, and a slide is slidably connected to the outside of the multi-directional frame. A climbing tooth plate that meshes with the sliding tooth plate is installed on the side of the slide near the transverse column tooth plate, and a third servo motor is installed at one end of the climbing tooth plate. One side of the carriage is provided with a limiting component for moving the abutment plate up and down.

[0010] Preferably, the limiting component includes a guide groove formed on one side of the carriage and a guide block sleeved on the outside of the third servo motor. The guide block is located inside the guide groove and slides with the guide groove inside it. One end of the guide block is fixedly connected to a horizontal short column. One end of the horizontal short column is fixedly connected to the top of the abutment plate, and the horizontal short column and the abutment plate form an L-shaped structure.

[0011] The specific process steps of a low-temperature extraction and concentration processing device for astaxanthin from marine shrimp and crab are as follows: S1. Intermittent wave desorption of the raw material surface: At this time, the pretreatment device is started. First, the abutment plate moves in a loop along the inside of the bearing box. During the movement of the abutment plate, its outer side is kept in intermittent contact with the outside of the decomposition tooth seat. Whenever contact occurs, the contact surface between the abutment plate and the decomposition tooth seat is at an inclined angle. Through this inclined intermittent contact, intermittent non-uniform contact friction waves are generated between the abutment plate and the outside of the decomposition tooth seat. Using this irregular squeezing and shearing wave, instantaneous positive and negative micro pressure difference is generated, which causes the original shells of shrimp and crabs attached to the outside of the decomposition tooth seat to peel off rapidly when subjected to alternating stress, which is conducive to the deposition and attachment of raw materials at the bottom of the decomposition tooth seat. S2. The adaptive flow of the double-layer conical channel, while the attached shells are being removed, before the shrimp and crab shells continue to fall through the carrier box, the channel gap between the decomposition tooth seat and the decomposition cylinder is automatically adjusted in real time according to the preset parameters of the adjustment component, so that the physical gap is at a fixed value that is slightly larger than the average particle size of the shrimp and crab shells, ensuring that the shrimp and crab shells can pass through in a stable single or multi-layer form, avoiding blockage caused by the small flow cross section. S3. Synchronous shearing and deep decomposition: The material then flows into the figure-eight channel formed by the decomposition tooth seat and the decomposition cylinder, and the shrimp and crab shells enter the depth of the figure-eight channel. Driven by the first servo motor of the power source, the decomposition tooth seat and the receiving plate rotate synchronously at a differential speed. At this time, the narrowed channel wall between the decomposition tooth seat and the decomposition cylinder undergoes three-dimensional shearing action with the shrimp and crab shells. The original hard calcareous and chitin fiber composite is forcibly disintegrated under shearing force and decomposed into a large number of small fragments. However, in the process of decomposing shrimp and crab shells, in order to prevent the accumulation of moist or sticky fragments in the dead zone between the decomposition tooth seat and the decomposition cylinder. S4. The internal drive source of the bottom ring frame is started, which drives the pre-separation ring frame to rotate along the inside of the bearing box. The top of the pre-separation ring frame forms a gradient fit with several force columns and swing rods. This fit drives the force columns and swing rods to move up and down and swing in a compound arc along the connection between the bearing box and the decomposition cylinder. This forces the shrimp and crab shell particles at the channel connection to be disturbed, ensuring the stable and continuous decomposition of shrimp and crab shells by the decomposition tooth seat and the decomposition cylinder. S5. Gravity classification and rotational collection of debris: As decomposition is completed, smaller shrimp and crab shell debris, under the action of gravity, falls vertically into the interior of the carrier box through the end of the figure-eight channel. During the falling process, these debris that meet the particle size requirements are accurately collected by the synchronously rotating receiving plate. The receiving plate carrying the shrimp and crab shell debris continuously drives the material to rotate along the interior of the carrier box and move towards the outlet of the carrier box. S6. During this conveying process, the abutment plate completes a return stroke of a loop. During the return stroke, the outer edge of the abutment plate comes into contact with the material on the surface of the receiving tray, and radially pushes the shrimp and crab shells collected on the surface of the receiving tray. This forces off any residual debris that is slightly attached to the surface of the receiving tray and helps to accelerate its movement toward the outlet of the carrying box. This allows the shrimp and crab shells to be fully decomposed and form a very high contact surface area. The material is output in a dispersed particle state with high activity and low heat loss, providing favorable mass transfer conditions for the stable and efficient dissolution of astaxanthin in the subsequent low-temperature extraction section.

[0012] The technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. This invention, through the arrangement of a decomposition toothed seat, a decomposition cylinder, a force column, and a pendulum rod, allows the force column and pendulum rod to guide the shrimp and crab shells driven by rotation into the channel between the decomposition toothed seat and the decomposition cylinder. The wide end of the channel formed by the decomposition cylinder and the decomposition toothed seat can accept irregularly shaped shell pieces with low flow resistance. The tapered section can force the shell pieces to slide along the constraint wall and adaptively adjust their posture, so that the long axis of the shell pieces gradually becomes consistent with the convergence direction of the channel, allowing them to enter the narrow-mouth high-shear zone with a stable posture. The cutting edge of the decomposition toothed seat applies local line contact high pressure to the shell pieces, while the decomposition cylinder simultaneously provides reaction force support. The two are not in a purely tangential closed state. Because the rotational linear velocity of the decomposition toothed seat is greater than the flow velocity of the shell pieces, the frictional forces on the two sides of the shell pieces are unequal in magnitude and opposite in direction, which can form a surface inside the shell pieces. The internal differential tearing stress field causes the shells to split along the weak surface of their natural texture, rather than being hard crushed. The inner wall of the channel surface formed by the decomposition cylinder and the decomposition tooth seat has a non-uniform curvature in the circumference. When the decomposition tooth seat rotates, the shells are thrown towards the cylinder wall under the action of centrifugal force. The variable curvature geometry of the channel allows the contact state between the shells and the wall to change circumferentially, which helps to reduce the local overheating and astaxanthin oxidation caused by long-term friction between the shells and the wall. It is also conducive to maintaining the uniform distribution of shear heat under low temperature conditions and reducing local accumulation. This allows the shrimp and crab shells to be fully decomposed. The decomposed shrimp and crab shells form a high contact surface area. The material is output in a dispersed particle state with high activity and low heat loss, providing excellent mass transfer conditions for the stable and efficient dissolution of astaxanthin in the subsequent low temperature extraction process. 2. This invention, through the arrangement of a pre-separating ring frame, four force columns, a toothed ring, and gears, allows the rotation of the pre-separating ring frame to pre-disturb and disperse the surrounding shrimp and crab shells. During the rotation of the pre-separating ring frame, the contact state with the four loosening rollers changes in a gradient. When the four loosening rollers contact the top of the pre-separating ring frame, they can drive the four support blocks to make trapezoidal alternating movements along the top of the pre-separating ring frame. That is, when a certain force column pushes upward, it forms a height difference with the adjacent force column and constitutes a stepped spatial wave. When the shell material flows through this area, the shells at different positions can be subjected to the up-and-down movement of the force columns at different depths. Asynchronous compression and release cycles are generated inside the shell stack layer. The force column at the wave crest can press the local shells against the decomposition tooth seat, and the adjacent force column at the wave trough can lift up to leave instantaneous expansion space. This allows the shell layer to be superimposed with periodic local loosening on the basis of the convergence effect of the figure-eight channel, which helps the shrimp and crab shells to continuously undergo shear surface sliding at the decomposition cylinder and decomposition tooth seat, so that each shell has the opportunity to contact the cutting edge. 3. The present invention, through the arrangement of hollow frame, force column, pre-separation ring frame and swing rod, the force column and swing rod can form an asymmetric conveying rhythm at the junction of the decomposition cylinder and the decomposition tooth seat. The shell can be subjected to alternating radial pushing and pulling forces at different circumferential positions, forming a disordered and fully covered disturbance state between the decomposition cylinder and the decomposition tooth seat. This can effectively disturb the steady distribution of the circulation layer generated by the rotation of the shell, which helps to continuously transport the raw materials far away from the decomposition tooth seat to the effective shearing zone. In turn, the spatially intersecting pressure field acts on the astaxanthin-enriched lipid layer, making it easy to produce fatigue fracture under repeated alternating positive and negative pressure, and achieve dissociation from the calcium layer. 4. The present invention, through the setting of the inter-adjustment component, the decomposition tooth seat and the decomposition cylinder, can adjust the radial gap between the decomposition tooth seat and the decomposition cylinder, that is, directly control the narrow width of the throat of the figure-eight channel. When the gap is reduced, the convergence ratio of the figure-eight channel increases, the compression gradient of the shell in the channel is steeper, the double-sided shear gap when passing through the throat is smaller, and the shear stress and tearing torque acting on the shell are correspondingly increased. When the gap is increased, the processing throughput of the equipment is improved. It can be flexibly switched according to the requirements of the subsequent extraction process for the particle size of the crushed shell, which helps to improve the whole-piece peeling ratio of the soft tissue enriched by astaxanthin in shrimp and crab shells. 5. The present invention, through the setting of the abutment plate and the decomposition tooth seat, the outer wall of the abutment plate is sloped to the outside of the decomposition tooth seat during the downward movement of the abutment plate. The shrimp and crab shells falling outside the continuously rotating decomposition tooth seat can be stably contacted with the abutment plate. The downward movement direction of the abutment plate is consistent with the gravity direction of the shrimp and crab shells. The peeled shell fragments can naturally fall to the surface of the receiving plate under the synergistic effect of gravity, which helps to reduce the local energy concentration and conversion into heat energy, and helps to ensure the decomposition effect of shrimp and crab shells. 6. The present invention, through the arrangement of multi-directional components, a carrier box, a receiving plate, and a stop plate, allows the stop plate to move along a loop trajectory inside the carrier box. The upward movement trajectory of the stop plate can be offset from the shell fragment accumulation, and it does not come into contact with the shell fragment accumulation during the movement. This reduces the situation where the shell fragments that have been pushed out are dragged back into the carrier box. At the same time, it is less likely to disturb the shell fragment layer waiting to be pushed out in the next cycle. The rightward movement of the climbing tooth plate can drive the slide to make a return movement to the right along the outside of the multi-directional frame. At this time, the bottom of the stop plate keeps in contact with the top of the receiving plate, which can push the surrounding shrimp and crab shells to move towards the outlet of the carrier box. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is a schematic diagram of the structure of the tooth holder of the present invention. Figure 3 For the present invention Figure 2 Enlarged view of section A in the image; Figure 4 This is a schematic diagram of the structure for adjusting the disintegration cylinder and disintegration tooth seat of the present invention; Figure 5 This is a schematic diagram of the reciprocating hole structure of the present invention; Figure 6 This is a schematic diagram of the pre-divided ring frame of the present invention; Figure 7 This is a schematic diagram of the structure of the guide seat of the present invention; Figure 8 This is a schematic diagram of the first motion state of the climbing tooth disc of the present invention; Figure 9 This is a schematic diagram of the second motion state of the climbing tooth disc of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1. Cryogenic treatment cylinder; 11. Carrying box; 2. Pre-processing components; 21. Disassembly cylinder; 22. Disassembly gear seat; 23. Force center column; 24. Swing rod; 25. Receiving plate; 26. First servo motor; 3. Quick-separation assembly; 31. Pre-separation ring frame; 32. Support block; 33. Loosening roller; 34. Hollow frame; 35. Hinge block; 36. Reciprocating hole; 37. Bottom ring frame; 38. Gear ring; 39. Mounting box; 301. Gear; 302. Second servo motor; 4. Adjustment assembly; 41. Connecting guide seat; 42. Adjusting bolt; 43. Ball; 44. Screw hole; 45. Slot; 46. Centering ring; 47. Return spring; 48. Ball cylinder; 5. Multi-directional component; 51. Multi-directional frame; 52. Carriage; 53. Horizontal column toothed plate; 54. Climbing tooth plate; 55. Guide groove; 56. Guide block; 57. Horizontal short column; 58. Abutment plate; 59. Third servo motor. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0017] This invention provides, for example Figures 1-7 The apparatus and process for low-temperature extraction and concentration of astaxanthin from marine shrimp and crab shown include a low-temperature treatment cylinder 1 and a carrier box 11. A pretreatment component 2 is provided between the low-temperature treatment cylinder 1 and the carrier box 11. The pretreatment component 2 is used to decompose the shrimp and crab shells into a large number of small fragments to significantly increase the contact surface area of ​​the material during the extraction process. The pretreatment component 2 includes a decomposition cylinder 21 fixedly connected to the junction of the cryogenic treatment cylinder 1 and the carrier box 11, and a decomposition toothed seat 22 disposed inside the carrier box 11. The decomposition toothed seat 22 is located inside the decomposition cylinder 21, and the two cooperate with each other to form a figure-eight shaped channel for guiding the directional flow of shrimp and crab shells. A receiving plate 25 is movably connected inside the carrier box 11, and the receiving plate 25 is sleeved on the bottom of the decomposition toothed seat 22. Several force-center columns 23 and swing rods 24 are installed at the junction of the cryogenic treatment cylinder 1 and the decomposition cylinder 21. A first servo motor 26 is installed at the bottom of the carrier box 11, and the output end of the first servo motor 26 extends into the interior of the carrier box 11 and connects with the receiving plate 25. The cryogenic treatment cylinder 1 is equipped with a quick-separation component 3, which drives several force core columns 23 and swing rods 24 to reciprocate up and down and swing in an arc along the connection between the cryogenic treatment cylinder 1 and the decomposition cylinder 21. The quick-separation component 3 includes a hollow frame 34 fixedly connected to the connection between the cryogenic treatment cylinder 1 and the decomposition cylinder 21 and a hinge block 35 fixedly connected to the bottom end of the force core column 23. The bottom of the hinge block 35 extends into the interior of the swing rod 24 and forms a hinge with the swing rod 24 inside. The swing rod 24 is movably sleeved on the outside of the hollow frame 34, and the hollow frame 34 is used to limit the movement direction of the swing rod 24. The top of the hollow frame 34 is movably connected to the bottom ring frame 37, and the top of the bottom ring frame 37 is designed as a trapezoidal structure. The top of the force column 23 is fixedly connected to the support block 32, and the bottom of the support block 32 is movably connected to the loosening roller 33. The surface of the loosening roller 33 slides with the top of the pre-dividing ring frame 31. The bottom of the pre-dividing ring frame 31 is fixedly connected to the toothed ring 38, and the toothed ring 38 is located inside the bottom ring frame 37. The outside of the bottom ring frame 37 is fixedly connected to the mounting box 39, which communicates with the inside. The inside of the mounting box 39 is fixedly connected to the second servo motor 302. The output end of the second servo motor 302 is fixedly connected to the gear 301, and the outside of the gear 301 is located inside the bottom ring frame 37 and meshes with the toothed ring 38. The top of the bottom ring frame 37 is provided with a reciprocating hole 36 for guiding the movement of the force core column 23, and the size of the reciprocating hole 36 is adapted to the force core column 23; The specific number of force core columns 23 is four. The number of swing rods 24, hinge blocks 35, reciprocating holes 36, support blocks 32, and loosening rollers 33 are consistent with that of force core columns 23. The components are matched and fitted together. It should be noted that the reciprocating holes 36 and force core columns 23 are elastically connected by springs. The outer dimensions of the force core column 23 are adapted to the diameter of the reciprocating holes 36, which can reduce the blockage problem caused by shrimp and crab shells passing through the gap between them. One end of the spring is sleeved on the outside of the force core column 23, so that the force core column 23 and the spring form a cross-shaped fit. The other end of the spring is fixedly connected to the inside of the reciprocating holes 36, which can provide elastic support for the section of the force core column 23 located inside the reciprocating holes 36. The spring's reset and installation structure is a conventional technology, so it will not be described in detail here. The main point here is to clarify that the force core column 23 and the reciprocating holes 36 have an elastic reset function. An adjustment component 4 is provided between the decomposition tooth seat 22 and the bottom ring frame 37. The adjustment component 4 is used to finely adjust the distance between the decomposition tooth seat 22 and the bottom ring frame 37. At the same time, the angle between the decomposition tooth seat 22 and the decomposition cylinder 21 is adjusted synchronously. The adjustment component 4 includes an adjustment bolt 42 screwed on the top of the decomposition tooth seat 22 and a centering ring 46 installed between the receiving plate 25 and the bearing box 11. The top centering ring 46 allows the decomposition tooth seat 22 to move along the internal guide of the receiving plate 25. A connecting guide seat 41 is installed on the top of the decomposition tooth seat 22. The connecting guide seat 41, the decomposition tooth seat 22 and the centering ring 46 are all provided with a screw hole 44 for the adjustment bolt 42 to be screwed in. The top of the adjusting bolt 42 is provided with a groove 45 that communicates with the inside of the screw hole 44, and the groove 45 is fitted with the bottom of the connecting guide seat 41. Several elastic components are provided between the disassembly tooth holder 22 and the centering ring 46; Each elastic component includes a ball cylinder 48 fixedly connected to the bottom end of the disintegration tooth seat 22 and a return spring 47 fixedly connected inside the centering ring 46. The top of the return spring 47 is fixedly connected to a ball 43, and the top of the ball 43 extends into the interior of the ball cylinder 48. In addition, the hollow frame 34 and the pre-separation ring frame 31 are both installed inside the cryogenic treatment cylinder 1, and sufficient distance is maintained between the hollow frame 34, the pre-separation ring frame 31 and the inner wall of the cryogenic treatment cylinder 1 to ensure that the shrimp and crab shells can pass through smoothly. The centering ring 46 is fixedly sleeved on the top of the first servo motor 26. When the first servo motor 26 is running, it can drive the centering ring 46 to rotate synchronously along the inside of the carrier box 11. The rotation of the centering ring 46 can synchronously drive the receiving plate 25 and the decomposition tooth seat 22 to rotate along the inside of the carrier box 11 and the decomposition cylinder 21. At the same time, the centering ring 46 can provide limiting guidance for the decomposition tooth seat 22 to move up and down along the guide between the receiving plate 25 and the centering ring 46.

[0018] refer to Figure 2 , Figure 3 , Figure 8 and Figure 9 As shown, the interior of the carrier box 11 is provided with a multi-directional component 5, which is used to push the surface shell of the receiving plate 25 to move towards the outlet of the carrier box 11 while engaging with the surface of the decomposition tooth seat 22. The multi-directional component 5 includes a multi-directional frame 51 fixedly connected inside the carrier box 11 and a stop plate 58 movably connected to the side of the multi-directional frame 51 near the decomposition tooth seat 22. The stop plate 58 and the decomposition tooth seat 22 maintain a slope fit. A horizontal column tooth plate 53 is fixedly connected to one side of the multi-directional frame 51, and a slide 52 is slidably connected to the outside of the multi-directional frame 51. A climbing tooth plate 54 that meshes with the slide 52 is installed on the side of the slide 52 near the horizontal column tooth plate 53. A third servo motor 59 is installed at one end of the climbing tooth plate 54. A limiting component is provided on one side of the carriage 52 for driving the abutment plate 58 to move up and down; the limiting component includes a guide groove 55 opened on one side of the carriage 52 and a guide block 56 sleeved on the outside of the third servo motor 59, and the guide block 56 is located inside the guide groove 55 and slides with the guide groove 55 inside the guide block 56. A horizontal short column 57 is fixedly connected to one end of the guide block 56, and one end of the horizontal short column 57 is fixedly connected to the top of the abutment plate 58, and the horizontal short column 57 and the abutment plate 58 form an L-shaped structure. The gap between adjacent teeth inside the transverse toothed plate 53 is adapted to the gap between the outer teeth of the climbing toothed plate 54. The climbing toothed plate 54 can move horizontally along the transverse toothed plate 53 by meshing with the outer teeth of the transverse toothed plate 53. When the climbing toothed plate 54 moves to the leftmost or rightmost position of the transverse toothed plate 53, the outer part of the climbing toothed plate 54 makes a circular climbing motion with the single cylindrical tooth of the leftmost or rightmost position of the transverse toothed plate 53 as the center point. During the movement of the climbing toothed plate 54, the guide block 56 can be driven to move downward or upward along the guide groove 55. At the same time, the cooperation between the guide block 56 and the guide groove 55 can limit the displacement direction of the climbing toothed plate 54, ensuring that the outer teeth of the climbing toothed plate 54 can smoothly complete the climbing action along the single cylindrical tooth of the leftmost or rightmost position of the transverse toothed plate 53. The transmission connection between the gear plate 54 and the third servo motor 59 is achieved by bevel gears (horizontal bevel gear and vertical bevel gear), and the bevel gears are assembled inside the guide block 56. The bevel gears and their mounting structure are existing conventional technologies, so they will not be described in detail here. The main point here is to clarify the drive transmission relationship between the gear plate 54 and the third servo motor 59.

[0019] refer to Figures 1-9 As shown, the process of using a low-temperature extraction and concentration processing device for astaxanthin from marine shrimp and crab is as follows: S1. Intermittent wave desorption of the raw material surface. At this time, the pretreatment device is started. First, the abutment plate 58 moves in a loop along the inside of the bearing box 11. During the movement of the abutment plate 58, its outer side is in intermittent contact with the outside of the decomposition tooth seat 22. Whenever contact occurs, the contact surface between the abutment plate 58 and the decomposition tooth seat 22 is at an inclined angle. Through this inclined intermittent contact, an intermittent non-uniform contact friction wave is generated between the abutment plate 58 and the outside of the decomposition tooth seat 22. Using this irregular squeezing and shearing wave, an instantaneous positive and negative micro pressure difference is generated, which causes the original shells of shrimp and crabs attached to the outside of the decomposition tooth seat 22 to peel off rapidly when subjected to alternating stress, which is conducive to the deposition and attachment of the raw material at the bottom of the decomposition tooth seat 22. S2. The adaptive flow of the double-layer conical channel, while the attached shells are being removed, before the shrimp and crab shells continue to fall through the carrier box 11, the channel gap between the decomposition tooth seat 22 and the decomposition cylinder 21 is automatically adjusted in real time according to the preset parameters of the adjustment component 4, so that the physical gap is at a fixed value that is slightly larger than the average particle size of the shrimp and crab shells, ensuring that the shrimp and crab shells can pass through in a stable single or multi-layer form, avoiding blockage caused by the small flow cross section. S3. Synchronous shearing and deep decomposition: The material then flows into the figure-eight channel formed between the decomposition tooth seat 22 and the decomposition cylinder 21, and the shrimp and crab shells enter the depth of the figure-eight channel. Driven by the first servo motor 26 of the power source, the decomposition tooth seat 22 and the receiving plate 25 generate synchronous differential rotation. At this time, the narrowed channel wall between the decomposition tooth seat 22 and the decomposition cylinder 21 undergoes three-dimensional shearing action with the shrimp and crab shells. The original hard calcareous and chitin fiber composite is forcibly disintegrated under shearing force and decomposed into a large number of small fragments. However, during the decomposition of shrimp and crab shells, in order to prevent the accumulation of wet or sticky fragments in the dead zone between the decomposition tooth seat 22 and the decomposition cylinder 21. S4. The internal drive source of the bottom ring frame 37 is activated, which drives the pre-separation ring frame 31 to rotate along the inside of the bearing box 11. The top of the pre-separation ring frame 31 forms a gradient fit with several force core columns 23 and swing rods 24. This fit drives the force core columns 23 and swing rods 24 to move up and down and swing in a compound arc along the connection between the bearing box 11 and the decomposition cylinder 21. This forces a disturbance to the shrimp and crab shell particles at the channel connection, ensuring the stable and continuous decomposition of shrimp and crab shells by the decomposition tooth seat 22 and the decomposition cylinder 21. S5. Gravity classification and rotational collection of debris: As decomposition is completed, the smaller shrimp and crab shell debris falls vertically into the interior of the carrier box 11 through the end of the figure-eight channel under the action of gravity. During the falling process, these debris that meet the particle size requirements are accurately collected by the synchronously rotating receiving plate 25. The receiving plate 25 carrying the shrimp and crab shell debris continues to drive the material to rotate along the interior of the carrier box 11 and move towards the outlet of the carrier box 11. S6. During this conveying process, the abutment plate 58 completes a return stroke of a loop. During the return stroke, the outer edge of the abutment plate 58 comes into contact with the material on the surface of the receiving plate 25, and radially pushes the shrimp and crab shells collected on the surface of the receiving plate 25. This forces off the residual debris that is slightly attached to the surface of the receiving plate 25 and helps to accelerate its movement toward the outlet of the carrying box 11. This allows the shrimp and crab shells to be fully decomposed and form a very high contact surface area. The material is output in a dispersed particle state with high activity and low heat loss, providing favorable mass transfer conditions for the stable and efficient dissolution of astaxanthin in the subsequent low-temperature extraction section.

[0020] Working principle: When using: refer to Figure 2 , Figure 4 and Figure 7 As shown, when shrimp and crab shells need to be pretreated to fully decompose them and form a high contact surface area, ensuring that the material is output in a highly active, low-heat-loss dispersed particle state, thus providing excellent mass transfer conditions for the stable and efficient dissolution of astaxanthin in the subsequent low-temperature extraction stage: First, based on the feeding conditions of the shrimp and crab shells, the gap between the decomposition tooth seat 22 and the decomposition cylinder 21 is adjusted in advance. The adjusting bolt 42 is rotated to complete the adjustment along the screw hole 44 inside the connecting guide seat 41, the decomposition tooth seat 22, and the centering ring 46. The top of the adjusting bolt 42 abuts against the top of the connecting guide seat 41, pushing the decomposition tooth seat 22 downwards along the receiving plate 25 and the centering ring 46. The ball cylinder 48 moves downwards synchronously with the decomposition tooth seat 22, its inner wall abutting against the ball 43. This causes the return spring 47 to undergo elastic compression deformation between the ball 43 and the centering ring 46. During the adjustment of the decomposition tooth seat 22, the elastic preload force of the return spring 47 can maintain the motion balance, and the elastic reaction force of the return spring 47 can also be used to achieve the desired effect. The size change indirectly reflects the contact state between the decomposition tooth seat 22 and the decomposition cylinder 21, thereby precisely controlling the radial gap between them. This directly adjusts the narrow width of the throat of the figure-eight channel. When the gap decreases, the convergence ratio of the figure-eight channel increases, the compression gradient experienced by the shell in the channel becomes steeper, and the double-sided shear gap when passing through the throat becomes smaller. The shear stress and tearing torque acting on the shell increase accordingly. When the gap increases, the processing throughput of the equipment increases. It can be flexibly switched according to the requirements of the subsequent extraction process for the particle size of the crushed shell. This is conducive to increasing the proportion of whole-piece peeling of astaxanthin-rich soft tissue inside the shrimp and crab shells, reducing the embedding depth of soft tissue in hard calcium debris, and reducing the interference of calcium impurities on the dissolution of astaxanthin in the subsequent extraction process. refer to Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, after adjusting the channel gap between the decomposition toothed seat 22 and the decomposition cylinder 21, the shrimp and crab shells are directionally conveyed into the decomposition cylinder 21 by the cryogenic treatment cylinder 1. The first servo motor 26 starts running, driving the centering ring 46 and the receiving plate 25 to rotate synchronously inside the bearing box 11. The rotation of the receiving plate 25 drives the decomposition toothed seat 22 to rotate inside the decomposition cylinder 21, so that a figure-eight-shaped channel for guiding the directional flow of shrimp and crab shells is formed between the decomposition cylinder 21 and the decomposition toothed seat 22. Under the rotational drive, the shrimp and crab shells are pushed into the channel. The wide end of the channel receives irregularly shaped shell pieces with low flow resistance characteristics. The tapered section forces the shell pieces to slide along the constraint wall and adaptively adjust their posture, so that the long axis of the shell pieces gradually becomes consistent with the convergence direction of the channel, and finally enters the narrow high-shear zone with a stable posture. In the decomposition tooth holder 22, the cutting edge applies local line contact high pressure to the shell plate, and the decomposition cylinder 21 provides reaction force support simultaneously. The two are not in a pure tangential closed state. Because the rotational linear velocity of the decomposition tooth holder 22 is greater than the flow velocity of the shell plate, the frictional forces on the two sides of the shell plate are unequal in magnitude and opposite in direction, forming an in-plane differential tearing stress field inside the shell plate, causing the shell plate to split along the weak surface of the natural texture, rather than being hard crushed. The channel curved surface inner wall of the decomposition cylinder 21 and the decomposition tooth holder 22 is designed with circumferential non-uniform curvature. When the decomposition tooth holder 22 rotates, the shell plate is thrown towards the cylinder wall under the action of centrifugal force component. The variable curvature geometry of the channel makes the contact state between the shell plate and the wall surface change circumferentially and periodically, avoiding local overheating and astaxanthin oxidation caused by long-term contact friction between the shell plate and the wall, and ensuring that there is no local accumulation of shear heat under low temperature conditions. refer to Figures 2-6 As shown, secondly, when the carrier box 11 continuously conveys shrimp and crab shells into the decomposition cylinder 21, the hollow frame 34 and the pre-separation ring frame 31 pre-disperse the shrimp and crab shells at the junction of the decomposition cylinder 21 and the low-temperature treatment cylinder 1, so that a floating gap is formed between the shrimp and crab shells outside the pre-separation ring frame 31 and the hollow frame 34, preventing the shrimp and crab shells from blocking when flowing around the pre-separation ring frame 31 and the hollow frame 34. The second servo motor 302 starts to drive, driving the gear 301 to rotate along the inside of the mounting box 39 and the bottom ring frame 37. The gear 301 meshes with the gear ring 38 to drive the gear ring 38 to guide the bottom ring frame 37. The toothed ring 38 rotates, causing the pre-separating ring frame 31 to rotate along the top of the hollow frame 34. During the rotation of the pre-separating ring frame 31, it disturbs and disperses the surrounding shrimp and crab shells. When the pre-separating ring frame 31 rotates, the contact state with the four loosening rollers 33 changes in a gradient, causing the four support blocks 32 to move in a trapezoidal alternating motion along the top of the pre-separating ring frame 31. When a certain force column 23 pushes upward, it forms a height difference with the adjacent force column 23, forming a stepped spatial wave. When the shell material flows through this area, the shells at different positions are subjected to the up-and-down movement of the force columns 23 at different depths, and an asynchronous compression and release cycle is generated inside the shell stack layer. refer to Figures 2-6As shown, the force column 23 at the crest presses the local shell pieces against the decomposition tooth seat 22, while the adjacent force column 23 at the trough lifts up to leave instantaneous expansion space. This allows the shell layer to undergo periodic local loosening on the basis of the convergence effect of the figure-eight channel, ensuring that the shrimp and crab shells continuously slide at the decomposition cylinder 21 and the decomposition tooth seat 22, giving each shell piece a chance to contact the cutting edge. During the position change of the pre-splitting ring frame 31, the force column 23 is elastically connected to the reciprocating hole 36, allowing the force column 23 to elastically reset along the inside of the reciprocating hole 36. During the reset process, the force column 23 drives the loosening roller 33 to maintain contact with the top of the pre-splitting ring frame 31, ensuring that the force column 23 resets synchronously with the movement of the pre-splitting ring frame 31, maintaining the height difference between the four force columns 23. The downward movement of the force column 23 pushes the hinge block 35 to move down synchronously, and the swing rod 24 is movably sleeved on the outside of the hollow frame 34. The hollow frame 34 swings against the outside. The movement direction of rod 24 forms a limit. When the hinge block 35 moves down, its outer wall abuts against the inner wall of the swing rod 24, pushing the swing rod 24 to move downward in an arc along the outside of the hollow frame 34. Similarly, the force column 23 moves upward and pulls the hinge block 35 to move upward along the inside of the swing rod 24, pulling the swing rod 24 to move upward in a semi-arc along the outside of the hollow frame 34. This causes the force column 23 and the swing rod 24 to form an asymmetrical feeding rhythm at the junction of the decomposition cylinder 21 and the decomposition tooth seat 22. The shell is subjected to alternating radial pushing and pulling forces at different circumferential positions, forming a disordered and fully covered disturbance state between the decomposition cylinder 21 and the decomposition tooth seat 22. This actively disrupts the steady distribution of the circulation layer generated by the rotation of the shell, allowing the raw materials far from the decomposition tooth seat 22 to be continuously re-fed into the effective shear zone. The spatially intersecting pressure field causes the lipid layer rich in astaxanthin to undergo fatigue rupture under repeated alternating positive and negative pressure, achieving dissociation from the calcium layer. refer to Figure 2 , Figure 3 , Figure 8 and Figure 9As shown, finally, the decomposed shrimp and crab shells fall into the carrier box 11 through the channel between the decomposition cylinder 21 and the decomposition tooth seat 22, and are collected by the receiving plate 25. The third servo motor 59 is started and driven to rotate the climbing tooth plate 54 between the slide 52 and the multi-directional frame 51. When the climbing tooth plate 54 rotates, with its outermost cylindrical tooth on the rightmost side of the horizontal column tooth plate 53 as the center point, the remaining tooth grooves of the climbing tooth plate 54 do not contact the cylindrical teeth inside the tooth plate 53. It makes a circular climbing motion along the right side of the horizontal column tooth plate 53, causing the guide block 56 to move upward along the inside of the guide groove 55 and abut against the groove wall. The climbing tooth plate 54 and the slide 52 are eccentrically arranged, and the guide block 56... The guide groove 55 moves upward and contacts the slide 52, pushing it to the left along one side of the multi-directional frame 51. Then, the remaining parts of the outer part of the climbing tooth disc 54 engage with the remaining cylindrical teeth inside the transverse column tooth plate 53, rolling along the outer part of the transverse column tooth plate 53. This causes the slide 52 to move horizontally to the left along one side of the multi-directional frame 51, gradually bringing the abutment plate 58 closer to the outside of the decomposition tooth seat 22. During this process, the abutment plate 58 does not contact the shrimp and crab shells inside the carrying box 11. Its upward movement trajectory is offset from the shell fragment accumulation, avoiding dragging the already pushed-out shell fragments back into the carrying box 11. At the same time, it does not disturb the shell fragment layer waiting to be pushed out in the next cycle. The climbing tooth disc 54 continues to rotate, with its outer part... Centered on the leftmost cylindrical tooth of the transverse toothed plate 53, a circular climbing motion is performed along the left side of the transverse toothed plate 53, causing the guide block 56 to move downward along the inside of the guide groove 55 and abut against the groove wall. The eccentric arrangement of the climbing tooth plate 54 and the slide 52 causes the guide block 56 to move downward along the guide groove 55, driving the abutment plate 58 to change from horizontal movement along the multi-directional frame 51 to downward movement. During the downward movement of the abutment plate 58, its outer wall partially slopes against the outside of the decomposition tooth seat 22. The shrimp and crab shells falling from the outside of the continuously rotating decomposition tooth seat 22 come into contact with the abutment plate 58. The downward movement direction of the abutment plate 58 is consistent with the direction of gravity of the shrimp and crab shells. The peeled shell fragments are then... Under the combined action of gravity, the shells naturally fall onto the surface of the receiving plate 25. After the remaining parts of the outer part of the climbing tooth plate 54 engage with the remaining cylindrical teeth inside the transverse tooth plate 53, the shells move to the right along the outer part of the transverse tooth plate 53, driving the slide 52 to return to the right along the outer part of the multi-directional frame 51. At this time, the bottom of the abutment plate 58 remains in contact with the top of the receiving plate 25, pushing the surrounding shrimp and crab shells to move towards the outlet of the carrying box 11, ultimately achieving full decomposition of the shrimp and crab shells. This results in a high contact surface area after decomposition, and the material is output in a dispersed particle state with high activity and low heat loss, providing excellent mass transfer conditions for the stable and efficient dissolution of astaxanthin in the subsequent low-temperature extraction section.

[0021] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A low-temperature extraction and concentration processing device for marine shrimp and crab-derived astaxanthin, comprising a low-temperature processing cylinder (1) and a carrier box (11), characterized in that: A pretreatment component (2) is provided between the low-temperature treatment cylinder (1) and the carrier box (11), and the pretreatment component (2) is used to decompose the shrimp and crab shells into a large number of small fragments to significantly increase the contact surface area of ​​the material during the extraction process; The pretreatment component (2) includes a decomposition cylinder (21) fixedly connected to the junction of the low-temperature treatment cylinder (1) and the carrier box (11) and a decomposition tooth seat (22) disposed inside the carrier box (11). The decomposition tooth seat (22) is located inside the decomposition cylinder (21). The two cooperate with each other to form a figure-eight channel for guiding the directional flow of shrimp and crab shells. The carrier box (11) is movably connected to a receiving plate (25), and the receiving plate (25) is sleeved on the bottom of the decomposition tooth seat (22). Several force core columns (23) and swing rods (24) are installed at the junction of the low-temperature treatment cylinder (1) and the decomposition cylinder (21). A first servo motor (26) is installed at the bottom of the carrier box (11), and the output end of the first servo motor (26) extends into the interior of the carrier box (11) and connects with the receiving plate (25). The cryogenic treatment cylinder (1) is equipped with a fast separation component (3), which is used to drive several force core columns (23) and swing rods (24) to move up and down and swing in an arc along the connection between the cryogenic treatment cylinder (1) and the decomposition cylinder (21); The interior of the carrier box (11) is provided with a multi-directional component (5), and the multi-directional component (5) is used to push the surface shell of the receiving plate (25) to move towards the outlet of the carrier box (11) while connecting and contacting the surface of the decomposition tooth seat (22).

2. The astaxanthin low-temperature extraction and concentration processing device for marine shrimp and crab sources according to claim 1, characterized in that: The fast separation component (3) includes a hollow frame (34) fixedly connected to the junction of the low temperature treatment cylinder (1) and the decomposition cylinder (21) and a hinge block (35) fixedly connected to the bottom of the force core column (23). The bottom of the hinge block (35) extends into the interior of the swing rod (24) and forms a hinge with the swing rod (24) inside. The swing rod (24) is movably sleeved on the outside of the hollow frame (34), and the hollow frame (34) is used to restrict the movement direction of the swing rod (24). The top of the hollow frame (34) is movably connected to the bottom ring frame (37), and the top of the bottom ring frame (37) is set as a trapezoidal structure. The top of the force core column (23) is fixedly connected to the support block (32), and the bottom of the support block (32) is movably connected to the loosening roller (33), and the surface of the loosening roller (33) slides with the top of the pre-divided ring frame (31).

3. The astaxanthin low-temperature extraction and concentration processing device for marine shrimp and crab sources according to claim 2, characterized in that: The bottom of the pre-divided ring frame (31) is fixedly connected to a toothed ring (38), and the toothed ring (38) is located inside the bottom ring frame (37). The outside of the bottom ring frame (37) is fixedly connected to a mounting box (39) that communicates with its interior. The inside of the mounting box (39) is fixedly connected to a second servo motor (302). The output end of the second servo motor (302) is fixedly connected to a gear (301), and the outside of the gear (301) is located inside the bottom ring frame (37) and meshes with the toothed ring (38). The bottom ring frame (37) has a reciprocating hole (36) at its top for guiding the movement of the force core column (23), and the size of the reciprocating hole (36) is adapted to the force core column (23); An adjustment component (4) is provided between the decomposition tooth holder (22) and the bottom ring frame (37), and the adjustment component (4) is used to drive the gap between the decomposition tooth holder (22) and the bottom ring frame (37) to make a fine adjustment, while the angle between the decomposition tooth holder (22) and the decomposition cylinder (21) is adjusted synchronously.

4. The astaxanthin low-temperature extraction and concentration processing device for marine shrimp and crab sources according to claim 3, characterized in that: The inter-adjustment assembly (4) includes an adjusting bolt (42) screwed onto the top of the decomposition tooth seat (22) and a centering ring (46) installed between the receiving plate (25) and the bearing box (11). The top centering ring (46) is provided with a guide for the decomposition tooth seat (22) to move along the inside of the receiving plate (25). A connecting guide seat (41) is installed on the top of the decomposition tooth seat (22). The connecting guide seat (41), the decomposition tooth seat (22) and the centering ring (46) are provided with a screw hole (44) for the adjusting bolt (42) to be screwed into place. The top of the adjusting bolt (42) is provided with a groove (45) that communicates with the inside of the screw hole (44), and the groove (45) is fitted with the bottom of the connecting guide seat (41); Several elastic components are provided between the decomposition tooth seat (22) and the centering ring (46).

5. The low-temperature extraction and concentration processing device for marine shrimp and crab astaxanthin according to claim 4, characterized in that: Each of the elastic components includes a ball cylinder (48) fixedly connected to the bottom end of the disassembly tooth seat (22) and a return spring (47) fixedly connected inside the centering ring (46), the top of the return spring (47) being fixedly connected to a ball (43), the top of the ball (43) extending into the interior of the ball cylinder (48).

6. The astaxanthin low-temperature extraction and concentration processing device for marine shrimp and crab sources according to claim 5, characterized in that: The multi-directional assembly (5) includes a multi-directional frame (51) fixedly connected inside the carrier box (11) and a stop plate (58) movably connected to the side of the multi-directional frame (51) near the decomposition tooth seat (22), and the stop plate (58) and the decomposition tooth seat (22) maintain a slope fit. A horizontal column tooth plate (53) is fixedly connected to one side of the multi-directional frame (51), and a slide (52) is slidably connected to the outside of the multi-directional frame (51). A climbing tooth plate (54) that meshes with the slide (52) is installed on the side of the slide (52) near the horizontal column tooth plate (53), and a third servo motor (59) is installed at one end of the climbing tooth plate (54). The slide (52) is provided with a limiting component on one side for driving the abutment plate (58) to move up and down.

7. The astaxanthin low-temperature extraction and concentration processing device for marine shrimp and crab sources according to claim 6, characterized in that: The limiting component includes a guide groove (55) opened on one side of the slide (52) and a guide block (56) sleeved on the outside of the third servo motor (59). The guide block (56) is located inside the guide groove (55) and slides with the guide groove (55) inside it. One end of the guide block (56) is fixedly connected to a horizontal short column (57). One end of the horizontal short column (57) is fixedly connected to the top of the abutment plate (58), and the horizontal short column (57) and the abutment plate (58) form an L-shaped structure.

8. The process for using the device for low-temperature extraction and concentration of astaxanthin from marine shrimp and crab sources according to claim 7, characterized in that, The specific process steps are as follows: S1. Intermittent wave desorption of the raw material surface. At this time, the pretreatment device is started. First, the abutment plate (58) moves in a loop along the inside of the bearing box (11). During the movement of the abutment plate (58), its outer side is kept in intermittent contact with the outside of the decomposition tooth seat (22). Whenever contact occurs, the contact surface between the abutment plate (58) and the decomposition tooth seat (22) is inclined. Through this inclined intermittent contact, intermittent non-uniform contact friction waves are generated between the abutment plate (58) and the outside of the decomposition tooth seat (22). By using this irregular squeezing and shearing wave, instantaneous positive and negative micro pressure difference is generated, so that the original shells of shrimp and crabs attached to the outside of the decomposition tooth seat (22) are quickly peeled off when subjected to alternating stress, which is conducive to the deposition and attachment of raw materials at the bottom of the decomposition tooth seat (22). S2. The adaptive flow of the double-layer conical channel, while the attached shells are being removed, before the shrimp and crab shells continue to fall through the carrier box (11), the channel gap between the decomposition tooth seat (22) and the decomposition cylinder (21) is automatically adjusted in real time according to the preset parameters of the inter-adjustment component (4), so that the physical gap is at a fixed value slightly larger than the average particle size of the shrimp and crab shells, ensuring that the shrimp and crab shells can pass through in a stable single or multi-layer form, avoiding blockage caused by the small flow cross section; S3. Synchronous shearing and deep decomposition: The material then flows into the figure-eight channel formed between the decomposition tooth seat (22) and the decomposition cylinder (21), and the shrimp and crab shells enter the depth of the figure-eight channel. Driven by the first servo motor (26) of the power source, the decomposition tooth seat (22) and the receiving plate (25) generate synchronous differential rotation. At this time, the narrowed channel wall between the decomposition tooth seat (22) and the decomposition cylinder (21) undergoes three-dimensional shearing action with the shrimp and crab shells. The original hard calcareous and chitin fiber composite is forcibly disintegrated under shearing force and decomposed into a large number of small fragments. However, in the process of decomposing shrimp and crab shells, in order to prevent the accumulation of wet or sticky fragments in the dead zone of the connection between the decomposition tooth seat (22) and the decomposition cylinder (21), S4. The internal drive source of the bottom ring frame (37) is started, which drives the pre-separation ring frame (31) to rotate along the inside of the bearing box (11). The top of the pre-separation ring frame (31) forms a gradient fit with several force core columns (23) and swing rods (24). This fit drives the force core columns (23) and swing rods (24) to move up and down and swing in a compound arc along the connection between the bearing box (11) and the decomposition cylinder (21). This forces the shrimp and crab shell particles at the channel connection to be disturbed, ensuring that the decomposition tooth seat (22) and the decomposition cylinder (21) decompose the shrimp and crab shells stably and continuously. S5. Gravity classification and rotational collection of debris. As decomposition is completed, the smaller shrimp and crab shell debris falls vertically into the interior of the carrier box (11) under the action of gravity through the end of the figure-eight channel. During the falling process, these debris that meet the particle size requirements are accurately collected by the synchronously rotating receiving plate (25). The receiving plate (25) carrying the shrimp and crab shell debris continuously drives the material to rotate along the interior of the carrier box (11) and move towards the outlet of the carrier box (11). S6. During this conveying process, the abutment plate (58) completes a return motion. During the return motion, the outer edge of the abutment plate (58) comes into contact with the material on the surface of the receiving plate (25), and pushes the shrimp and crab shells collected on the surface of the receiving plate (25) radially. This forces the residual debris that is slightly attached to the surface of the receiving plate (25) to fall off and helps to accelerate its movement toward the outlet of the carrying box (11). This allows the shrimp and crab shells to be fully decomposed and form a very high contact surface area. The material is output in a dispersed particle state with high activity and low heat loss, providing favorable mass transfer conditions for the stable and efficient dissolution of astaxanthin in the subsequent low-temperature extraction section.

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